Tree species | Assortment | Average model residuals, % | |
---|---|---|---|
old model | new model | ||
Scots pine | saw log | 6.74 | −0.01 |
firewood | −1.33 | −0.82 | |
Norway spruce | saw log | 7.78 | 2.40 |
firewood | −3.67 | −2.55 | |
Birch species | saw log | 11.83 | 1.23 |
firewood | 2.21 | −0.16 | |
European aspen | saw log | 0.75 | 0.42 |
firewood | 22.48 | −2.34 | |
Black alder | saw log | −17.98 | −7.84 |
Grey alder | saw log | −33.45 | −2.99 |
Tree species | Age used in the Estonian model | Estonian model ( |
|||
---|---|---|---|---|---|
MELA-96 | MELA-05 | Bucking simulation | |||
Pine | 60–100 | 16.04 | 24.25 | 18.17 | 9–28% |
Spruce | 60–80 | 2.35 | 17.79 | 6.38 | 10–29% |
Birch | 50–70 | 30.27 | 29.35 | 41.46 | 38–64% |
Site index |
Site index class | Site index class in calculations |
---|---|---|
< 11.5 | 5A | 6 |
11.5…15.5 | 5 | 5 |
15.5…19.5 | 4 | 4 |
19.5…23.5 | 3 | 3 |
23.5…27.5 | 2 | 2 |
27.5…31.5 | 1 | 1 |
> 31.5 | 1A | 0 |
Relative diameter of a tree in relation to the diameter of a stand element | Number of trees, per mille |
---|---|
0.4 | 11 |
0.5 | 34 |
0.6 | 59 |
0.7 | 96 |
0.8 | 131 |
0.9 | 154 |
1.0 | 154 |
1.1 | 132 |
1.2 | 96 |
1.3 | 64 |
1.4 | 35 |
1.5 | 18 |
1.6 | 10 |
1.7 | 4 |
1.8 | 2 |
Tree species | No. of elements | Age, years | Site index class | ||
---|---|---|---|---|---|
minimum | maximum | maximum | minimum | ||
Scots pine ( |
14,013 | 21 | 219 | 1A | 5A |
Norway spruce ( |
3,045 | 16 | 177 | 1A | 5 |
Silver and downy birch ( |
7,145 | 22 | 153 | 1A | 5 |
European aspen ( |
1,862 | 23 | 140 | 1A | 3 |
Black alder ( |
679 | 37 | 138 | 1A | 4 |
Grey alder ( |
770 | 18 | 75 | 1A | 4 |
Total | 27,514 | 16 | 219 | 1A | 5A |
Tree species | Assortment | Top diameter, cm | Length, m | ||
---|---|---|---|---|---|
minimum | step | Maximum | |||
Scots pine | Log | 28–… | 3.1 | 0.3 | 6.1 |
Log | 23–28 | 3.1 | 0.3 | 6.1 | |
Log | 18–23 | 3.1 | 0.3 | 6.1 | |
Log | 13–18 | 3.1 | 0.3 | 6.1 | |
Log | 10–13 | 3.1 | 0.3 | 6.1 | |
Pulpwood | 5 | 3.0 | 3.0 | ||
Firewood | 3 | 3.0 | 3.0 | ||
Norway spruce | Log | 25–… | 3.1 | 0.3 | 6.1 |
Log | 18–25 | 3.1 | 0.3 | 6.1 | |
Log | 13–18 | 3.1 | 0.3 | 6.1 | |
Log | 10–13 | 3.1 | 0.3 | 6.1 | |
Pulpwood | 5 | 3.0 | 3.0 | ||
Firewood | 3 | 3.0 | 3.0 | ||
Silver and downy birch | Log | 14–… | 3.1 | 0.3 | 6.1 |
Pulpwood | 5 | 3.0 | 3.0 | ||
Firewood | 3 | 3.0 | 3.0 | ||
European aspen | Log | 14–… | 3.1 | 0.3 | 6.1 |
Pulpwood | 5 | 3.0 | 3.0 | ||
Firewood | 3 | 3.0 | 3.0 | ||
Black alder | Log | 18–… | 3.1 | 0.3 | 6.1 |
small log | 14–18 | 3.1 | 0.3 | 6.1 | |
Firewood | 3 | 3.0 | 3.0 | ||
Grey alder | Log | 18–… | 3.1 | 0.3 | 6.1 |
small log | 14–18 | 3.1 | 0.3 | 6.1 | |
Firewood | 3 | 3.0 | 3.0 |
Tree species | Assortment | p-value | |||||||
---|---|---|---|---|---|---|---|---|---|
Scots pine | Log volume reduction | −0.4560 | −6.7947 | −46.8016 | 99 | 100 | 1 | 0.0356 | < 0.0001 |
Firewood increase | 2.7817 | 1.0015 | 267.0156 | 99 | 100 | 1 | 0.0233 | < 0.0001 | |
Norway spruce | Log volume reduction | 0.2145 | 6.7871 | −0.0656 | 1 | 20 | 1.1 | 0.0158 | < 0.0001 |
Firewood increase | −3.1086 | 17.2571 | −91.9444 | 49 | 50 | 0.1 | 0.0195 | < 0.0001 | |
Silver and downy birch | Log volume reduction | 1.0622 | 9.1595 | 0.3487 | 10 | 50 | 1 | 0.0945 | < 0.0001 |
Firewood increase | 0.1733 | 3.2363 | 0.0063 | 0,1 | 1 | 1 | 0.0052 | < 0.0001 | |
Veneer log | −3.6396 | 10.4272 | −2.6481 | 10 | 20 | 0.1 | 0.1445 | < 0.0001 | |
European aspen | Log volume reduction | 1.0522 | 12.6587 | 15.8415 | 49 | 50 | 1 | 0.1991 | < 0.0001 |
Firewood increase | −1.0607 | 28.4761 | −0.0969 | 0.1 | 0.2 | 0.1 | 0.0381 | < 0.0001 | |
Black alder | Log volume reduction | 0.6106 | 22.1975 | −0.0837 | 1 | 2 | 1 | 0.0789 | < 0.0001 |
Grey alder | Log volume reduction | −6.106 | 12.485 | −61.485 | 90 | 100 | 1 | 0.0353 | 0.0257 |
Tree species | Formula | Constant | Equation coefficients | |||
---|---|---|---|---|---|---|
Scots pine | log volume reduction | a | −2.259 | 0.24693 | −0.01345 | 3 |
b | 11.35752 | −2.10076 | 0.1712 | |||
c | 894.235 | −304.766 | 28.869 | |||
firewood increase | a | −3.3503 | 0.0159 | −0.0013 | 2 | |
b | 1.5375 | −0.0271 | 0.0022 | |||
c | 1.5328 | −0.0261 | 0.0021 | |||
Norway spruce | log volume reduction | a | −0.89371 | −0.13886 | 0.01049 | 4 |
b | 29.4603 | 4.36432 | −0.33114 | |||
c | −366800 | −228124 | −4093 | |||
firewood increase | a | −1.66542 | −0.06081 | 0.0012 | 4 | |
b | 29.59224 | 0.27817 | 0.09189 | |||
c | −115756 | −24063 | 89.533 | |||
Silver and downy birch | log volume reduction | a | −0.39607 | 0.06595 | −0.0032 | 5 |
b | 28.784 | −1.088 | 0.042 | |||
c | 3829316 | 885112 | 80082 | |||
firewood increase | a | −1.67591 | 0.01012 | −0.00097 | 4 | |
b | 25.21899 | −0.21777 | 0.02076 | |||
c | −211985 | 7782.9 | −749.88 | |||
veneer block recovery | a | −2.7282 | −0.2457 | −0.0683 | 4 | |
b | 30.281 | 12.921 | −1.639 | |||
ln(-c) | 12.655 | 0.8226 | 0.2254 | |||
European aspen | log volume reduction | a | 0.09015 | 0.01429 | −0.00061 | 4 |
b | 27.49482 | −0.06593 | −0.01049 | |||
c | −150369 | 7285 | −387 | |||
firewood increase | a | −1.34789 | −0.01386 | 0.0011 | 5 | |
b | 46.31225 | 0.04688 | −0.00447 | |||
c | 10507971 | 920148 | −82200 | |||
Black alder | firewood increase | a | 0.1209 | −0.09111 | 0.01198 | 10 |
b | 73.66109 | −4.70172 | 0.78866 | |||
c | −2.703·1015 | −5.258·1015 | 6.974·1014 | |||
Grey alder | firewood increase | a | −0.82187 | −0.30129 | 0.00434 | 7 |
b | 58.03680 | −0.13325 | 5.87003 | |||
c | 3.048·1011 | −2.887·1011 | 4.242·1012 |